Simplify by combining like terms: 4a+7b−2a+3b4a + 7b - 2a + 3b4a+7b−2a+3b
2a+10b2a + 10b2a+10b
6a+10b6a + 10b6a+10b
2a+4b2a + 4b2a+4b
12ab12ab12ab